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G Cup Bras: The Complete Guide
So, you're a G cup; and you need to figure out the best path to navigate this big bust "blessing". I'm Tish Tily, Bra Store owner and someone who floats between a FF and G cup herself. As someone who once went way further up the alphabet, pre my breast reduction, I certainly understanding all there is to consider about buying bras for the fuller bust.
What a G cup actually means.
I am often surprised that women don't actually know how cup sizes work, but with bra fittings being so hard to come by in Australia, it's certainly understandable.
Being a G cup means that there is 9 inches difference between the broadest part of your bust, compared to your ribcage cage.
Society would typically associate being a G cup as having "big boobs". As a Bra Fitter I would say that a G cup is where we probably start to consider people as being "busty"; and the boob to body ratio does become more challenging from a bra fitting perspective.
A G cup nowadays, is probably what DD cups were to society 20 years ago. After all, boobs are getting bigger 🫣.
And did you know that a 10G is 3 cup sizes smaller than a 16G?! If that's news to you then you really need to read this post about understanding how bra sizing actually works.
G Cup in Australian, UK and US sizing
So here's where we start to add a degree of difficulty.
Remember when I told you above that a G cup means that there is 9 inches difference between the broadest part of your bust, compared to your ribcage cage? Well that is true for the UK sizing system. And it's also the way reputable Bra Fitters in Australia will refer to a size G.
But in the US brand will interchange G cup's as being either an 8 or 9 inch difference in bust to ribcage.
Some Australian brands (like Berlei) also treat G cup as being and 8 inch difference in bust to ribcage. This is because Berlei, along with other brands, don't produce a FF cup - so the G cup is in essence a FF cup. And their H cup is what the UK and reputable Australian Bra Fitters would refer to as a G cup.
So you do have to remember, as will any garment, sizing is up to the interpretation of the brand and does very from country to country.
Why G Cup bras are harder to find?
Unfortunately mainstream retail still considers a DD cup as a big cup size. Spoiler alert, it's not! A DD cup is simply the average size in Australia. For this reason they consider the G cup as being a very small percentage of women at the edge of the size bell curve. As a result they will naturally stock fewer options in these "fringe" sizes.
To add to this, because society is still under the impression that a DD cup is "big", larger busted ladies will often self select this size which adds fuel to the fire of G cup bras being under represented in stores.
As a career Bra Fitter, I know that there is absolutely nothing unusual or rare about G cup boobs in Australia. One of the reasons we started She Science way back in 2013 is because so many common sizes were considered "hard to find" sizes in Australia - and we wanted to put a stop to that.
Did you know that if a bra doesn't fit, it cannot function (from a physics perspective, that is)? So it's no wonder why busty women after feel their bras are letting them down.
What to look for in a G Cup bra
✅ Rigid materials in the bottom half of the cup (and the top half if you are serious about strong support)
✅ Wide straps
✅ 3-4 Hook and Eye clasps on the ribcage band
✅ Multiple points of adjustability eg Ribcage band and straps
✅ A strong, hard to stretch ribcage band
❌ Thin straps
❌ Ultra soft, stretchy materials
❌ No adjustability
The list above are truly not "nice to haves" in a G cup bra. They are necessary for the support required to cart around a heavy bust day-in-day-out. That being said, we can all have our "sometimes bras" that don't tick every box below for special occasions or nights on the couch.
How a G Cup bra should fit
With a heavier bust there isn't really anywhere to hide when it comes to getting the fit right.
✅ Underwire needs to full encase breast tissue, no spillage
✅ Underwire needs to sit snuggly against the sternum, not sitting away from it
✅ The ribcage band needs to be fitted firmly, so it can't be pulled out more than 1.5" from the body
Click on the image below to watch quick video on 'How a Bra Should Fit and Why' 👇🏽
The best bra styles for a G Cup
Sports Bras
Yes! G cup girlies can get adequate support to be active.
You just need to make sure you're ticking the right boxes with the style you choose. Be sure to shop for the following...
✅ Sports Bras designed in cup and band sizes eg 14G
✅ Wide straps
✅ Full coverage cups
✅ Strong rigid fabrics
❌ Avoid alpha sized bras (eg Size S, M, L) that look like fashion sports crops
T-Shirt Bras
A well fitted T-shirt bra that's the right shape for your bust should not make your boobs look bigger, I promise. It's just about finding the right one for you.
✅ Think carefully about how rigid you want the cup foam. A rigid foam will give more structure and lift. A softer spacer foam will offer more forgiveness at the top of the cup.
✅ Wide straps
✅ Full coverage cups or lower coverage cups with a lace overlay
✅ Strong rigid fabrics
❌ Don't skip a Bra Fitting with a T-Shirt Bra. You will need to try on a few before you find your match.
Plunge Bras
A plunge bra can work wonders for a fuller bust, but fit is paramount to ensure
✅ Make sure you nail the fit
✅ Rigid cup fabric
✅ Cinch in straps are a nice feature to add support
✅ Wide straps
Wire Free Bras
Wire Free Bras can be an option for bigger busts, so long as you choose your features wisely.
✅ Wide straps
✅ Full coverage cups
✅ Strong rigid fabrics where it matters, like the ribcage band
❌ Don't expect to get the same separation out of a wire free bra as you do from your underwire bra.
"My favourite wire free bras for a G cup is the Evelyn Bobbie Busty Bra - She's a winner!"
Balconette Bras
Balconnette Bras are a great way to get a lovely rounded shape and nice lift for a busty girl. Make sure to seek out the following:
✅ Strong rigid materials in the base of the cup
✅ Stretch mesh across the top of the cup
✅ Firm ribcage band
FAQs
Is a G Cup considered large?
Put simply, A G cup is the point at which most careers bra fitters would start to consider someone as being large busted. A G cup customer has a disproportionate amount of bust to their frame, but its not so excessive that its typically problematic.
What is a G cup in US sizing?
Not all US brands are the same. But typically a US G cup equates to a UK FF cup.
Is a G cup the same as a DDDD?
If you follow the US sizing structure of C>D>DD>DDD>DDDD; a DDDD is actually equivalent to a US F cup.
Why do my G cup bras keep riding up at the back?
This has everything to do with the fit, and nothing to do with the fact your bra is a G cup. Any bra that is not fitted firmly enough around your ribcage will ride up your back. If this is happening to you and you are currently wearing a 14G, i'd try a size 12GG to see if this works better.
Where can I buy G Cup bras in Australia?
Shop with a specialty retailer like She Science, who skew their stock to the sizes Australian women actually need. Avoid mainstream retailers that still treat G cup as an anomaly or "edge of the bell curve" size, which it's not.
What comes after a G cup?
A GG cup is considered a whole cup size larger than a G cup, although some brands jump straight to a H cup. Here's a quick snapshot of how bra sizing extends after a G cup in reputable Australian bra stores. G cup > GG cup > H cup > HH cup > J cup and beyond.
Written by Tish Tily, Co-Founder and Bra Fitter
She Science, our Specialty Bra Store offers cup sizes A - K and band sizes 6 - 24. We work with 22 industry leading brands from all over the world. Our comprehensive Sports and Everyday Bra fitting service is available by appointment, out of our fitting suite in Hawthorn, Melbourne (Australia). Come on in and we'll find you your best match taking in to account your size, shape, activity demands and personal style preferences. Our team of experienced bra fitters would love to meet you.
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